20121122111 has 2 divisors, whose sum is σ = 20121122112. Its totient is φ = 20121122110.

The previous prime is 20121122059. The next prime is 20121122117. The reversal of 20121122111 is 11122112102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121122111 - 2²² = 20116927807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121122117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060561055 + 10060561056.

It is an arithmetic number, because the mean of its divisors is an integer number (10060561056).

Almost surely, 2^20121122111 is an apocalyptic number.

20121122111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121122111 is an equidigital number, since it uses as much as digits as its factorization.

20121122111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20121122111 its reverse (11122112102), we get a palindrome (31243234213).

It can be divided in two parts, 201211 and 22111, that added together give a palindrome (223322).

The spelling of 20121122111 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred eleven".